How to sync videos from computer onto my iphone 4?

I have videos that I took with my friend's phone and I uploaded the videos and the pictures onto my computer. I'm now trying to sync the videos from my computer to my iphone 4. I synced the pictures but the videos will not sync for whatever the reason may be. When I select the album with the videos it says there's 0 anything. What is the problem because I really want to get these videos onto my iphone 4 but itunes won't let me sync them onto it. It let me sync the pictures but not the videos. What is the problem? I don't know what type of file the videos are but I think they are AVI.

Convert the.avi video to the file format that can be recognize by your iPhone or iTunes.
It should be mp4 I suppose.
You can try Any Video Converter Free.

ITunes can't recognize AVI files, and iPhone can't play AVI files either. You need to convert the AVI files to the iPhone supported formats first, then try to sync it with iTunes or other third-party software. You may try Any Video Converter Free or Free iPhone Transfer Syncios to do it. Syncios can convert video/audio to iphone supported formats and sync them to iphone. Also it is a ringtone maker.http://www.syncios.com/

Both of Any Video Converter Free and Syncios are totally free. Simply have try.

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